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The p-Block Elements

Short Answer Type

451. Why is sulphuric acid a good dehydrating agent?

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452. What happens when conc. H₂SO₄ is slowly added to cane sugar?

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453. Which form of sulphur shows paramagnetic behaviour?

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454. What happens when
(i) Concentrated H₂SO₄ is added to calcium fluoride
(ii) SO₃ is passed through water?

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455. Why ozone is more reactive than oxygen?

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456. Sulphur melts to clear mobile liquid at 119°C, but on further heating above 160°C, it becomes viscous. Why?

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457. The wooden shelf under the reagent bottle containing concentrated H₂SO₄ blacken after somtime. Why?

Conc. H₂SO₄ being a strong dehydrating agent thus having extreme attraction for water, and it can pull the hydrogen and oxygen out of the wood (cellulosic material) leaving behind black carbon.

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458. Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine. Why?

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459. Arrange the following in the decreasing order of bond energy; F₂, Cl₂, Br₂ I₂.

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460. Why fluorine has low electron gain enthalpy than chlorine?

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Short Answer Type

457. The wooden shelf under the reagent bottle containing concentrated H2SO4 blacken after somtime. Why?

457. The wooden shelf under the reagent bottle containing concentrated H₂SO₄ blacken after somtime. Why?